Type-writer.



S. A. THOMPSON.

TYPE WRITER.

APPLICATION FILEDAPIL. I9I6. v 1 204 912. Patented Nov. 14, 1916. '7 1 2 SHEETSvSHEET I.

O O O O u l l I,

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TYPE WRITER.

APPLICATION mw Ama, 191s.

1 ,204,9 1 2 Patented Nov. 14, 1916.

2 SHEETS-SHEET 2- e734 as se 3o 5.A.Thompson A TTOH/VE V8 UNTED STATES SAMUEL A. THOMPSON,

OF NEW YORK, N. Y.

TYPE-WRITER.

Specification of Letters Patent.

Patented Nov. 14, 1916.

Application led April 8, 1916. Serial No. 89,810.

To all whom t may concern.'

Be it known that 1, SAMUEL A. THOMP- soN, a citizen of the United States, and a resident of the city of New York, borough of Manhattan, in the county and State of New York, have invented a new and Improved Type-Vl7riter, of which the following is a full, clear, and exact description.

My invention relates to a class of typewriting machines in which the carriage is provided with a rotary type form having printing types arranged in an angular series near the edge, the carriage being adapted to be depressed for printing after locating the type at the printing point.

The invention relates particularly to a feed means for the carriage and to tracky engaging means to give guided movement to the carriage.

A general object of the invention is` to provide a typewriter of theindicated class formed of parts that may be cheaply produced and assembled with facility, and of a character that will permit of ready dismembering of the parts for repair or other purposes.

A more particular object of the invention is to improve the feed means with a view to insure an impression without blurring, and yet provide, by simple form of feed devices, for the positive and accurate feeding or propelling of the carriage by the depression of the carriage for printing.

A further object of the invention is to provide a novel means for effectively engaging the carriage with the track wlth sufficient friction to hold the carriage against movement except as it is positively propelled by the feed means.

Other objects, as well as advantages of the improved construction will appear as the description proceeds. 1

Reference is to be had to the accompany-v ing drawings forming apart of this specili-v cation in which similar reference characters indicate corresponding parts in all the views. if

Figure 1 is a plan view of a typewriten embodying my invention, part being brokenl;

tion on the line 2-2, Fig. 1; Fig. 3 is a Fig. 1; Fig. 4 is a detail in longitudinal :a similar View (of `the feed devices with the iup from the plate 16.

carriage depressed; Fig. 6 is an inverted yplanvlew of the carriage; Fig. 7 is a detail in cross section on the line 7-7, Fig. 6;

Y is returned in hooked form as at 15 and adjacent to said returned edge is an angular flange 17 on a plate 16 which is held in position at the under side of the plate 14. The two members, 15, 17, receive a track 18 formed on the baserplate 10, said track being S-shaped in cross section, the upper terminal .edge being disposed rearwardly and being received within the returned element 15 of the carriage, the track presenting beneath the terminal 18, aA forwardly extending intermediate bend 19, which is received between the forwardly disposed terminal of the member 15 and the rearwardly disposed terminal of the angular member 17; The angular flange 17 and the returned member 15 are held in yielding frictional engagement with the track 18 as hereinafter described.

On the plate 14, Fig. 9, is formed a hole 2O for the pivot 13. As one means to secure said plate 14 to the carriage 11, tongues 21 are provided which extend through suitable slits in the bottom of the carriage.

To effect the desired frictional engagement between the track 18 fand the carriage,

springs 22 are provided formed of springV Y wire returned on itself so that the spring, in general, is of U-shape presenting two arms; bend thereof embracing a tongue 23 stamped One arni of each [spring 22 engages with a tongue 24 bent from the plate 14,-the respective tongues away; Fig. 2 is a longitudinal vertical sec-iii 24 projectingthrough openings 25 in the plate 16. Adjacent to each tongue 24 and transverse vertical section on the line 8-3,i} oppos'ltely disposed thereto, 1s a tongue 26 fon the plate 16 to be engaged by the other arms ofthe respective springs 22. It will be seen from Fig. 6, that the springs 22 -by their pressure eigerted on the tongues, 24,

Each spring has a loop 22a at theV 1 being a lift pawl. The pawl 27 engages a longitudinal rack 29 on the base 10, and the pawl 28, which is at right angles to the pawl 27, may bear against the rack as in the present example, oragainst the adjacent surface of the base 10.

The feed pawl 27 rocks in bearing ears, 30, 30, stamped up from the plate 14. A retractile spring 31 is secured at one end by a tongue 32 on the plate 14, and on the opposite end is formed with an arm 33 which is securedv by a tongue 34 on the pawl 27. Trunnions, 35, 36, are integral with the sheet metal pawl 27 and have considerable width, that is to say, they are not round but are angular in cross section. As best seen in Figs. 4 and 5, the trunnion 36 is disposed at an angle to the general plane of the pawl 27. The pawl 27, with the trunnions and bearings thereof, as well as the form and ar# rangement of the spring 31 and its arm 33, are such that the necessary traveling movement of the carriage will be completed before the type form is sufliciently depressed for printing, the purpose being to have the traveling movement of the carriage terminate before the printing to prevent blurring by insuring a direct vertical movement of the plate 14 in making the impression. This result is produced as follows: Vhen the carriage is in the raised position, the nose of the pawl 27 will be in position to engage a tooth on the rack 29. Upon depression of the carriage and with it the plate 14 and the bearing lugs, 30, 30a, the pivoted end of the pawl 27 will be depressed, the pawl having a tendency to rock with the nose thereof as a pivot.` By reason of the engagement of the trunnions-with the walls of the bearing lugs, and the angular position of the trunnion 36, as the said trunnion is depressed, the latter will come into engagement with the upper wall 37 of the bearing so that the adjacent angle 0f the trunnion 36 by contact with the wall 37, will rock the pawl with the point thereof as a center so that the opposite edge of the trunnion 36 will pass downward along the front wall 38 of the bearing, and the pawl willnow have the bearing point at the,

angleformed by the wall 38 and the lower wall 38of the bearing, as in F ig. 5. At the same time, the pawl 27, under they strain of the downward movement and while at all times under the tension of the spring 31, will slightly rise at the nose toward the top of the engaged' tooth. The wall 38 is inclined to facilitate the downward movement of the trunnion 36 thereon.

The pawl 27 in approaching and assuming the position shown in Fig. 5, which is the printing position of the carriage, will have y pawl and the shifting of the bearing point y of the trunnion 36 to the lower end of the wall 38 may in fact throw the pawl across the dead center and lock the same, but in any event, the movement across the center will be but slight and the restoration of the pawl to a position to insure a pullingk action by the spring 31 being effected by the arm 33 of the said spring, which arm (see Fig. 6), will by the complete depression of the carriage, bear against the edge 40 of the pawl, thus putting said arm 33 under slight lateral strain so that upon the operator releasing the downward pressure on the carriage, the arm 33 restores itself to the straight position and tends to react on the pawl so that the spring 31 may exert its pull.

In order not torely on the lifting action of the pawl 27 under tension of its spring 31, the lifting pawl 28 is provided and has trunnions, 41, 42, in bearing lugs 43, on the lplate 14. A spring 44 is secured at one end by a tongue 45 on the said plate 14 while the opposite end of the spring is secured by a tongue 46 to the pawl 28. The trunnion 35 and a trunnion 42 are preferably bent at approximately right angles to prevent displacement ofthe pawls.

Stops are provided to limit the movement vof the carriage in either direction, there being stop tongues 47 on the base 10 adjacent to the track 18 and a stop 48 bent downwardly and laterally from the plate 16 at the center adapted to contact with the stops 47. Any approved inking means may be provided, there being shown a known form of pads 49 on a bar 50, secured to the plate 14 by a tongue 51, which tongue serves also to secure the front end of the plate 14 to the carriage 11 as best seen in Fig. 3. The cross sectional form of the track 18 and track-engaging members, 15, 17, effect the necessary rockable connection of the carriage while in suring the desired guided movement and the necessary frictional engagement with the track to prevent accidental shifting of the carriage.

It will beknoted that the springs 22 being permanently vfastened to the plate 16 by the lugs 23, will be properly located by the mere placing of the said plate in position and this contributes to the facility of assembling these parts and the proper engagement of the spring'arms with the tongues, 24, 26,

The described typewriter is intended to be made up inl small sizes adapted to be contained in a box 55, the cover 56 of which is formed with longitudinal slits 53 near each end. These slits are adaptedto receive flat rearwardly projecting members 54 formed on or secured to the base plate l0. The inner ends 54a of said members 54 are offset so as to engage the cover 56 at the under side,

thereby retaining the typewriter in position on the box and permitting the base to be tilted for the placing of a sheet of paper or envelop beneath the base l0 for printing. A scale 52 is preferably provided on the box cover at the front.

Having thus described my invention I claim as new and desire to secure by Letters Patent:

l. A typewriter including a rack, a type carriage, a feed pawl on the carriage at the under side engageable with said rack, a track S-shaped in cross section and presenting an overhanging laterally disposed free edge portion at the top, and means on the carriage rockably and slidably engaging the said track, the said means comprising a track-engaging element on the carriage return bent in the reverse direction to the said free edge portion of the track and engaging beneath the same, a second track-engaging element disposed on the carriage atV the under side and having a flange angular in cross section, said flange bearing against the track at the front thereof and extending beneath the intermediate bend of said track, and spring means engaging said second element and engaging a relatively fixed portion of the carriage and yieldingly pressing the said track-engaging elements against the track. Y

2. A typewriter including a rack, a type carriage, feed means on the carriage adapted to engage said rack, a track S-shaped in cross section and presenting -an overhanging laterally disposed free edge portion at the top, a Vtrack-engaging element on the carriage return bent in curved form in reverse direction to the said edge'portion and engaging beneath the latter, a second trackengaging element disposed on the carriage at the under side, and presenting a member bearing' against the track at the front thereof, said second track-engaging element having an opening therein, and a relatively fixed part of the carriage having a'lug projecting through said opening, there being an'0p.

positely disposed lug on said second element, and a U-shaped spring, the arms of which engages respectively, with the said lugs. 4

3. A typewriter including a type carriage, a rack, feed means on the carriage adapted to engage said rack to propel the carriage, a track S-shaped in cross section and presenting an overhanging laterally disposed free edge portion at the top, and means on the carriage rockably and slidably engaging the latter with the track, said means comprising a track-engaging element return bent beneath the said free edge portion of the track, a second track-engaging element bers on the said second element adjacent to one arm of each spring and against which said arms exert their pressure, and tongues on a relatively fixed portion of the carriage against which the opposite arms of the said springs bear, the second track-engaging element having openings through which the said tongues extend.

l. A typewriter including a type carriage, a track on which the carriage is rockably and slidably mounted, a rack, a pawl on the carriage adaptedto engage said rack, and a retractile spring connected respectively with the said pawl and with a relatively fixed part of the carriage, the carriage having depending lugs at the under side, and the pawl having trunnions angular in cross section and having bearings in said lugs, one of the trunnions being disposed at an angle to the general plane of the pawl, the rear edge of said angularly disposed trunnion being adaptedto contact with the upper wall of its bearing upon depression of the carriage, the adjacent front wall of said bearing forming a contact surface for the rear edge of the pawl along which front edge the said rear edge of the pawl is adapted to shift upon the mentioned contact of the front edge.

5. A typewriter including a type carriage, a track on which the carriage is rockably and slidably mounted, a rack, a pawl rockably mounted on the carriage at the under side, a retractile spring having a. longitudinal arm at one end, the end of the arm being Y fastened to said pawl, and the pawl presenting a transverse edge portion adjacent to the said arm of the spring, t-he opposite end of the said spring being secured to a. relatively fixed part of the carriage. Y

6. A typewriter including a type carriage, a track on which the carriage is rockably 4and slidably mounted, a rack,` a pawl on the carriage adapted to engage said rack, and a retractile spring connected respectively, with the said pawl and with a relatively fixed part of the carriage, the carriage having depending lugs at the under side, and the pawl having trunnions angular in cross section and having bearings in said lugs, one of the trunnions bein at an angle to the general plane o the pawl,

disposed Y the rear ledge of said singularly disposed trunnion beingadapted to Contact with the upper Wall of its bearing upon depression of the carriage, the adjacent front wall of 5 said bearing beinginolined to the top and bottom Walls and forming a Contact surface for the `iront edge of the pawl along which .front edge the said front edge of the paWl is adapted to shift upon the mentioned con- 10 tact ofthe front edge.

l A T. The combination With a support having slits therein, of a typewriter including a base having flat extension members formed with oset ends adapted to be passed through the said slits. 15

In testimony whereof I have signed my naine to this specification in the presence of two subscribing witnesses.

SAMUEL A. THOMPSON. itnesses J. L. MCAULIFFE, PHILIP D. RoLLHAUs.

Copies of. this patent may be obtained for ve cents each, by addressing the Commissioner of Patents,

` Washington, D. G. 

